sc15

Question 1

What is dynamic equilibrium?

Answer 1

• forward and backward reactions happen at the same time
• no change in amount of product

Question 2

Why is higher temperatures better for the haber process?

Answer 2

• reaches equilibrium faster
• more frequent collisions
• favours endothermic / backwards reaction
• yield of ammonia lowered
• equilibrium shifts to the left

Question 3

Why is the use of a catalyst good for the haber process?

Answer 3

• reaches equilibrium faster
• equilibrium position not affected
• lowers activation energy

Question 4

compare the production of ammonium sulfate in the lab and industrially

Answer 4

similarities :
- both use sulfuric acid
- both are examples of neutralisation

differences :
- industrial is large scale while in the lab its small scale
- ammonia is a gas in the industrial process but a solution in the lab
- industrial process has much more stages

Question 5

what are the advantages and disadvantages of using hydrogen fuel cells?

Answer 5

advantages :
- fuel cells don’t need maintenance
- they operate as long as reactants are supplied
- only water is produced so can be used to drink

disadvantages:
- hydrogen and oxygen must be supplied
- hydrogen is flammable
- they are expensive to manufacture

Question 6

what is the feature of a chemical cell?

Answer 6

it produces a voltage until one of the reactants is used up